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Based on distribution characteristics of the luminescence decay spectra respectively produced by neutrons and gamma interacting with the CLYC (Cs LiYCl) scintillator and the SiPM-array based CLYC detector output signals, the front-end readout electronic model matched with the detector output signal characteristics was designed with the Multisim toolkit in the present work. The main factors affecting on the front-end system output signal distribution and the stability of the detector power supply were analyzed. The key circuit modules of the front-end readout electronic system (including pole-zero cancellation, preamplifier and S-K filter, etc.) and an optimized model of the detector power supply circuit module based on DC–DC chip (APW7137BITRG) were established at first. Secondly, according to the front-end system output signal characteristics and the n/γ PSD algorithmic model based on the charge comparison method, the n/γ PSD digital data acquisition and processing system based on ADC (AD9680) and FPGA (AXU5EG) was designed and tested. Finally, the n/γ PSD spectrum of the atmospheric irradiation spectrometer at the China Spallation Neutron Source was experimentally obtained with the designed system. The FoM factor deduced from the PSD spectrum was about 0.8. The experimental results prove that the function for n/γ PSD was achieved by the designed electronic system for the SiPM-array based CLYC detector.

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Electronic System Design on the n/γ Signal Pulse Shape Discrimination (PSD) for SiPM-Array Based CLYC Detector

  • 会议论文

  • 发表日期：

    2026年

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  • Ximin Zhang,
  • Shuhuan Liu,
  • Yunfeng Sun,
  • Fanjun Meng,
  • Shijie Zhu,
  • Chao Wang,
  • Tian Xing,
  • Rami Ahmed,
  • Junye Zhou,
  • Zhiliang Hu,
  • Guang Hu

摘要

Based on distribution characteristics of the luminescence decay spectra respectively produced by neutrons and gamma interacting with the CLYC (Cs LiYCl) scintillator and the SiPM-array based CLYC detector output signals, the front-end readout electronic model matched with the detector output signal characteristics was designed with the Multisim toolkit in the present work. The main factors affecting on the front-end system output signal distribution and the stability of the detector power supply were analyzed. The key circuit modules of the front-end readout electronic system (including pole-zero cancellation, preamplifier and S-K filter, etc.) and an optimized model of the detector power supply circuit module based on DC–DC chip (APW7137BITRG) were established at first. Secondly, according to the front-end system output signal characteristics and the n/γ PSD algorithmic model based on the charge comparison method, the n/γ PSD digital data acquisition and processing system based on ADC (AD9680) and FPGA (AXU5EG) was designed and tested. Finally, the n/γ PSD spectrum of the atmospheric irradiation spectrometer at the China Spallation Neutron Source was experimentally obtained with the designed system. The FoM factor deduced from the PSD spectrum was about 0.8. The experimental results prove that the function for n/γ PSD was achieved by the designed electronic system for the SiPM-array based CLYC detector.